Humphreys collecting data for the Tearoom Trade study under the pretense that he was a lookout is an example of a violation of the principle of?

Humphreys' actions in the Tearoom Trade study exemplify a violation of the principle of informed consent. By misrepresenting his role and not disclosing his true purpose to the participants, he deprived them of the opportunity to make an informed decision about their involvement in the study. This raises ethical concerns regarding privacy and respect for individuals' autonomy.